Pump for elastic fluids.



K. STEINBEGKEB.

PUMP ron ELASTIC mums.

APPLIOATXOI FILED Ill. 13, 1012.

1,076,462, Patented Oct. 21, 1913.

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UNITED STATES PATENT OFFICE.

KARL STEINBECKER. OF CHARLOTTENBURG, GERMANY. ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

PUMP FOR ELASTIC FLUIDS.

To all whom it may concern:

Be it known that I, KARL Srsmnacxsn, a subject of the King of Prussia, residing at Charlottenburg, Germany, have invented certain new and useful Improvements in Pumps for Elastic Fluids, of which the following is a specification.

The present invention relates to pumps for elastic fluid and more especially to those for supplying air to high compression internal combustion engines.

The object of my invention is to improve the construction of such pumps whereby they are rendered more effective for compressing fluids to relatively high pressures.

A further object of my invention is to provide a pump which is simple and rugged in character and of minimum size for the work to be performed.

For a consideration of what I believe to be novel and my invention, attention is directed to the accompanying description and claims appended thereto.

In the drawin is illustrated in axial section a pump embodying my invention.

The pump shown is of the multi-stage type, that is to say, the fluid is compressed in two or more successive operations.

1 indicates the main or low pressure cylinder which is provided with an external housing 2 formed integral therewith. Between the housing and the cylinder wall is an inlet chamber 3 and a discharge chamber 1. the walls between the chambers being indicated by dotted lines 5. It will thus be seen that each chamber extends substantially half way around the cylinder.

6 and 7 indicate inwardly opening check valves controlling the assage of air through ports from the cham er 3 to the interior of the cylinder. This portion of the pump being of the double acting type two of such valves are necessary.

8 and 9 indicate outwardly opening discharge valves that control the passage of fluid through ports from the cylinder to the chamber 4.

Located within the cylinder is a piston comprising an annular portion 10 that makes a snug fit in the bore of the cylinder and Specification of Letters Patent.

Application filed March 13, 1912.

Patented Oct.21, 1913.

Serial No. 683,503.

a central web portion 11 that is downwardly inclined from the center to the peripheral portion 10. The center is thickened to form a hub through which the piston rod 12 extends. The lower end of the rod is provided with a shoulder and between it and the piston hub is securely clamped an annular guide 13 made in the form of an open ended piston. Such a piston is sometimes referred to as a trunk piston. By making it of suitable length and well fitting the use of a stufling box is obviated.

14 indicates an inset head for the cylinder 1. It is made hollow to decrease the weight and also to extend into the cylinder in a manner to afford a small clearance space when the piston is in its lowest position. The head is provided with a flange that is bolted to the under side of the housing. The central part of the head has a relatively large bore in which the guide piston 13 makes a snug fit. The upper end of the cylinder is provided with a head 15 that is also chambered to decrease its weight. It is provided with a conical peripheral portion that makes a snug fit with a similarly shaped part of the cylinder. This head in addition to acting as such for the low pressure cylinder forms a support for the high pressure cylinder 16 that is bolted or otherwise secured thereto. To avoid making additional parts and the expense incident thereto, the piston rod 12 is extended to form the high pressure piston. the latter being very much smaller in diameter than the low pressure piston. This arrangement also enables me to dispense with a packing on the upper side of the piston. Seated in the upper end of the high pressure cylinder is a casing 17 containing a spring pressed inlet valve 18 and a spring pressed discharge valve 12. To form a tight joint between the casing and cylinder end the contacting surfaces are made of tapered or conical form. The inlet valve 18 receives air or other elastic fluid from the discharge chamber 4 of the low pressure stage by the pipe 20 that IS suitably connected to the housing and the valve casing. This portion of the pump 18 single acting, that is to say, sucks in fluid on the downward stroke and after compressing it on its upward stroke discharges it through the valve 19 to the pipe 21 leading to the fluid consuming apparatus.

In order to drive the pump, the lower end of the piston rod is provided with a head 22 having a projection that enters a fork 23 and is pinned or bolted thereto. The fork is united by a connecting rod 24 to a motor of any sort.

In order to carry oif low pressure fluid, a conduit 25 is provided which enters the discharge chamber 4. By throttling this pipe more or less air will pass through it and the remainder pass by the pipe 20 to the second stage of the pump and have its pressure further increased. This also enables me to supply low pressure air for scavenging purposes and hlgh pressure air for injectin fuel into the combustion space of the engine. By this arrangement it is possible to use only the low pressure part of the ump as a fluid compressing device.

ether the second stage is used or not, the high pressure piston acts as a guide for one side of the low pressure piston. In so far as my improved structure is concerned, the pumps need not be serially connected for each ump may be arranged to compress fluid lndependently of the other. In such an arrangement the connecting pipe 20 would be omitted.

The guide piston 13 in addition to serving as a packing means also relieves the wall of the cylinder 1 of the thrust of the low pres sure piston and iston rod. By locating the guide piston wit in the lower cylinder head I and shaping the parts as shown, the overall length of the pump can be reduced to a minimum for the work to be performed.

In accordance with the provisions of the patent statutes. I have described the prin ciple of operation of my invention together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States. is,-

1. In a pump, the combination of a housing having a cylinder inlet and discharge chambers between the housing and cylinder and which surrounds the latter, a piston that has an inclined web and peripheral portion forming a double acting piston, heads for the cylinder-both of which have inclined surfaces corresponding to the faces of the inclined web, one of said heads projecting into the cylinder and having a central bore, a guide that reciprocates in the bore and also forms a packing, a rod that extends through the piston into the guide, means on the rod for clamping the piston to the guide, a head on the rod, a driving connection secured to said head, and suction and discharge valves at both ends of the cylinder which convey fluid to and from said chambers and the inside of the cylinder.

2. In a multi-stage pump, the combination of a housing which is open at both ends and is provided with an inner and an outer wall, the inner one forming a cylinder, means dividing the space between the walls int-o an inlet and a discharge chamber, a double acting piston for the cylinder comprising an inclined web and a cylindrical peripheral portion, a head for one end of the cylinder having a wall conforming in inclination to that of one side of the piston, a head for the other end of the cylinder that projects into the piston and is provided with a wall conforming in inclination to that of the other side of the piston, said head having a central bore, a guide that snugly fits the bore and also acts as a acking, a second cylinder mounted on one 0? the heads of the first, the bore of which opens into the first cylinder, a rod for the first piston which also forms the piston of the second cylinder, means on the rod for clamping the first piston and the guide together, a connecting rod attached to one end of the piston rod, and valves for the cylinders.

3. In a' pump, the combination of a vertically disposed housing comprising a cylinder and sup ly and discharge chambers, a lower head or the cylinder having an inset that projects into it and is provided with a relatively large central bore and an inclined top, a guide in said bore which in its lowest position is substantially flush with the bottom of the head, a piston that has an inclined central part or web and a downwardly extending cylindrical part which on its downward stroke extends between the cylinder and said inset, an u per head for the cylinder that has an inclined face corresponding to said web, a second cylinder mounted on the upper head, a rod that forms the piston for the second cylinder and extends freely through the first piston, said rod having a head that engages the guide, means on the rod for clamping the piston against the guide, a driving means connected to the head, and valve means for the cylinders.

4. In a multi-sta e compressor, the combination of low and high pressure cylinders arranged in axial alinement, the former cylinder being mounted on the head of the latter, a piston for the low pressure cylinder having a downwardly extending annular portion and a connecting web, an inset lower head for the low pressure cylinder, a tubular guide located within the head, a head for the upper end of the cylinder that supports high pressure cylinder, and admission and 10 the high pressure cylinder, a housing for the discharge valves for the said cylinders.

main cylinder only which contains suction In Witness whereof, I have hereunto set and discharge chambers that surround said my hand this 21st day of February, 1912. cylinder, a conduit conveying from K discharge chamber, a second conduit conveying fluid from said chamber to the high pres- Witnesses: sure cylinder, a rod for the low pressure HENRY HAsPnR, cylinder that also acts as a piston for the WOLDEMAR HAUPT.

Copies of this patent may be obtained for five cents each, by addressing the commissioner of Patents. Washington, D. 0.

It is hereby certified that in Letters Patent No. 1,076,462, granted October 21,

1913, upon the application of Karl Steinbecker, of Charlottenhurg, Germany, for an improvement in Pumps for Elastic Fluids, an error appears in the printed specification requiring correction as follows: Page 1, line 92, for the reference-numeral 12 read 19 and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the casein the Patent Otfice.

Signed and sealed this 18th day of November, A. D., 1913.

[SEAL] R. T. FRAZIER,

Acting Commissioner of Patents. 

